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Extreme Heat and Tropical Storm Bertha Impacts

Dangerous heat will expand from the Gulf Coast into the Southern Plains and Desert Southwest through week's end. Additional extreme heat impacting the Pacific Northwest will shift to the northern Plains by the weekend. Tropical Storm Bertha is expected to continue to impact portions of the northern Gulf Coast from the western Florida Panhandle to southeastern Louisiana through tonight. Read More >

Current conditions at

Janesville-Rock County (KJVL)

Lat: 42.62°NLon: 89.04°WElev: 801ft.

Mostly Cloudy

72°F

22°C

Humidity 38%
Wind Speed NE 6 mph
Barometer 30.11 in
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 22 Jul 2:45 pm CDT
Extended Forecast for

Janesville WI

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 52. North wind around 5 mph becoming calm in the evening.

    Low: 52 °F

    Decreasing
    Clouds

  • Thursday

    Thursday: Increasing clouds, with a high near 77. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 77 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 56. South wind around 5 mph becoming calm.

    Low: 56 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 80. Light south wind increasing to 5 to 10 mph in the morning.

    High: 80 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 60. South wind around 5 mph.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 85. South wind 5 to 10 mph.

    High: 85 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Southwest wind around 5 mph.

    Low: 68 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 91. West wind 5 to 10 mph.

    High: 91 °F

    Hot

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68.

    Low: 68 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 52. North wind around 5 mph becoming calm in the evening.
Thursday
Increasing clouds, with a high near 77. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 56. South wind around 5 mph becoming calm.
Friday
Mostly sunny, with a high near 80. Light south wind increasing to 5 to 10 mph in the morning.
Friday Night
Partly cloudy, with a low around 60. South wind around 5 mph.
Saturday
Mostly sunny, with a high near 85. South wind 5 to 10 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Southwest wind around 5 mph.
Sunday
Mostly sunny and hot, with a high near 91. West wind 5 to 10 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68.
Monday
A slight chance of showers and thunderstorms. Mostly sunny and hot, with a high near 90. Chance of precipitation is 20%.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 66.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville WI
 42.69°N 89.01°W (Elev. 863 ft)
Last Update:
2:47 pm CDT Jul 22, 2026
Forecast Valid:
3pm CDT Jul 22, 2026-6pm CDT Jul 29, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation